Method and system for generating compensation data, display panel and compensation method thereof

This application claims priority to and the benefit of Chinese Patent Application No. 202311830208.1, filed on Dec. 27, 2023, the disclosure of which is incorporated herein by reference in its entirety.

The present disclosure relates to the field of display technologies, and more particularly, to the manufacture of display devices, and specifically, to a method and system for generating compensation data, a display panel, and a compensation method thereof.

With the continuous development and popularization of displays, various industries have increasingly high requirements for display colors. Color accuracy may be used as a basis for judging the degree of accuracy for colors, in order to quantify whether a display correctly presents colors.

However, for displayed pictures with high color requirements, it is often required to operate across multiple displays. Even for a same display, it will be affected by differences such as in panel technology, resulting in an inconsistency between colors in the final presentation and the color accuracy, leading to color distortion.

Therefore, existing LCD products suffer from the above problems and urgently need to be improved.

It is an object of the present disclosure to provide a method and system for generating compensation data, a display panel, and a compensation method thereof.

The present disclosure provides a method for generating compensation data, which is applied to a display panel, the display panel including a display area, the display area including a first area and a second area, a size of the first area being smaller than a size of the second area, the method for generating compensation data including: acquiring standard optical data of the display panel corresponding to one or more standard pictures, and first actual optical data of the first area corresponding to the one or more standard pictures; generating corresponding first compensation data according to a first compensation rule, the standard optical data, and the first actual optical data; compensating the display panel according to the first compensation data, and acquiring second actual optical data of the second area in the compensated display panel corresponding to the one or more standard pictures; generating corresponding second compensation data according to a second compensation rule, the standard optical data, and the second actual optical data, a compensation accuracy of the second compensation rule being less than a compensation accuracy of the first compensation rule.

The present disclosure also provides a compensation method for a display panel which is applied to the display panel, the display panel including a display area, the display area including a first area and a second area, a size of the first area being smaller than a size of the second area, the compensation method including: acquiring initial display data of one or more pictures to be displayed, the initial display data including first initial display data corresponding to the first area and second initial display data corresponding to the second area; acquiring second compensation data corresponding to the second area, and compensating the second initial display data according to the second compensation data to generate intermediate display data corresponding to the second area; acquiring first compensation data corresponding to the display area, compensating the first initial display data and the intermediate display data according to the first compensation data, respectively, to generate first display data and second display data, respectively, a compensation accuracy of the second compensation data being less than a compensation accuracy of the first compensation data.

The present disclosure also provides a display panel including: a panel body; a memory for storing the first compensation data and the second compensation data as described above; a controller for invoking the first compensation data and the second compensation data to perform the compensation method for the display panel as described above.

The present disclosure further provides a system for generating compensation data, which is applied to a display panel, the display panel including a display area, the display area including a first area and a second area, a size of the first area being smaller than a size of the second area, the system for generating compensation data including: an optical instrument configured to acquire first actual optical data of the first area corresponding to one or more standard pictures; a computer configured to acquire standard optical data of the display panel corresponding to the one or more standard pictures; wherein the computer is further configured to generate corresponding first compensation data according to a first compensation rule, the standard optical data, and the first actual optical data; wherein the computer is further configured to compensate the display panel according to the first compensation data; wherein the optical instrument is further configured to acquire second actual optical data of the second area in the compensated display panel corresponding to the one or more standard pictures; wherein the computer is further configured to generate corresponding second compensation data according to a second compensation rule, the standard optical data, and the second actual optical data, wherein a compensation accuracy of the second compensation rule is less than a compensation accuracy of the first compensation rule; wherein the computer is further configured to generate a compensation file applied to the display panel according to the first compensation data and the second compensation data.

The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. It will be apparent that the described embodiments are only part of the embodiments of the present disclosure and not all of them. Based on the embodiments of the present disclosure, all other embodiments obtained by a person skilled in the art without involving inventive efforts fall within the scope of the present disclosure.

In the description of the present disclosure, the terms “first”, “second” and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined by “first”, “second” and the like may explicitly or implicitly include one or more of the described features. In addition, it should be noted that the accompanying drawings only provide structures that are relatively closely related to the present disclosure, and some details that are not closely related to the present disclosure are omitted. The purpose is to simplify the drawings and make the inventive concepts clear at a glance, without indicating that the accompanying drawings is exactly the same as the device(s) in actuality or that they are set to be the limitation(s) of the device(s) in actuality.

Reference herein to “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present disclosure. The appearances of this phrase in various places in the specification do not necessarily refer to a same embodiment, nor do they necessarily refer to separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The present disclosure provides a method of generating compensation data to be applied to a display panel, which may include, but is not limited to, the following embodiments and combinations of the following embodiments.

In some embodiments, as shown in, the method for generating compensation data may include, but is not limited to, the following steps Sto Sand combinations of the following steps Sto S.

At step S, standard optical data of a display panel corresponding to one or more standard pictures, and first actual optical data of a first area corresponding to the one or more standard pictures is acquired.

The display panel in the present embodiment may be a liquid crystal display panel or a self-luminous display panel. As shown in, the display panelincludes a display area including a first areaand a second area. The size of the first areais smaller than the size of the second area. The display area may be construed as an area for displaying one or more pictures in the display panel in which a plurality of pixels may be provided, each of which emits light under control of a corresponding data voltage so that the display area presents the displayed picture(s). The specific positions of the first areaand the second areaare not limited herein, and either of the two may be disposed near or away from the center of the display area. Here, it is sufficient to satisfy that the size of the first areais smaller than the size of the second area, and there is no limitation on the relationship between the number of pixels in the two areas. If a plurality of pixels may be uniformly distributed in the display area, then the number of the pixels in the first areamay be considered to be smaller than the number of the pixels in the second area. Of course, for other distributions of pixels, it is also possible to allow the number of pixels in the first areato be greater than or equal to the number of pixels in the second area.

Specifically, the above-described pixels may be understood as pixel cells or sub-pixels, and the pixel cell may include a plurality of sub-pixels of different colors. In the present disclosure, reference is made only to examples in which each of the pixel cells includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel for explanation. Ranges of the grayscale values of the sub-pixels of each color may be the same. The sub-pixels of each color may have corresponding data voltages at each grayscale value. The data voltages of the sub-pixels of different colors at a same grayscale value may be the same or different in consideration of the differences in characteristics of the sub-pixels of different colors. The display panel may drive each sub-pixel to emit light using the corresponding data voltage based on the grayscale value of the sub-pixel. For example, the grayscale value of each sub-pixel may be taken from any one between 0 and 255, which corresponds to 256 data voltages. The display panel may store a mapping relationship between the grayscale values and the data voltages of the sub-pixels of respective colors.

The standard picture may be construed as a pure-color picture, that is, grayscale values of the sub-pixels of a same color in different pixel cells are the same. For example, the grayscale values of red sub-pixels in each pixel cell may all be R, the grayscale values of green sub-pixels in each pixel cell may all be G, and the grayscale values of blue sub-pixels in each pixel cell may all be B. Thus, the standard picture may have a set of corresponding R, G, and B.

The number of the standard pictures is greater than one. Each of the standard pictures has corresponding standard optical data. In combination with the above discussion, each standard picture has a set of corresponding R, G and B, with a plurality of red sub-pixels emitting light under the control of the data voltage corresponding to R, a plurality of green sub-pixels emitting light under the control of the data voltage corresponding to G, and a plurality of blue sub-pixels emitting light under the control of the data voltage corresponding to B so as to present the standard picture. The standard optical data may be construed as the optical information that the display area should theoretically possess at the moment.

Specifically, the optical data in the present disclosure may include a total luminance value of a corresponding area, and total luminance values of sub-pixels of respective colors. For example, as shown in, the display area may be divided into nine areas A, B, C, D, E, F, G, H, I having sizes close or even equal to each other. Here, the standard optical data may include a total luminance value of the nine areas, a luminance value of each of the nine areas, a luminance value X of all red sub-pixels in the entirety of the nine areas, a luminance value Y of all green sub-pixels in the entirety of the nine areas, a luminance value Z of all blue sub-pixels in the entirety of the nine areas, and a luminance value X of all red sub-pixels in each of the nine areas, a luminance value Y of all green sub-pixels in each of the nine areas, a luminance value Z of all blue sub-pixels in each of the nine areas. Here, the term “luminance value” indicates a theoretical luminance value of an object given the standard picture(s).

Specifically, as shown in, the step Sof acquiring the first actual optical data of the display panel corresponding to the one or more standard pictures may include, but is not limited to, the following steps Sand Sand combinations of the following steps Sand S.

At step S, initial display data corresponding to the standard pictures is acquired.

The initial display data may include grayscale values of each sub-pixel in each pixel cell in the display area, or in other words, the grayscale values of each sub-pixel in each pixel cell may be determined from the initial display data. As discussed above, sub-pixels of a same color in different pixel cells have the same grayscale values given the standard picture(s), that is, the initial display data may be used to determine at least the grayscale value R of all red sub-pixels, the grayscale value G of all green sub-pixels, and the grayscale value B of all blue sub-pixels given the standard picture(s).

At step S, optical data of a displayed picture of the first area under control of the initial display data is acquired as the first actual optical data.

Similarly, based on the existence of a plurality of standard pictures, the first areahas corresponding first actual optical data for each of the standard pictures, that is, the first areahas corresponding first actual optical data given each of the standard pictures.

As can be seen from the above discussion, a set of corresponding R, G, and B may be determined from the initial display data corresponding to each of the standard pictures, and then three data voltages corresponding to the standard picture may in turn be determined. Further, a plurality of pixel cells in the display area may be driven to emit light by the three data voltages, and optical data of the first areameasured at the moment may be used as the first actual optical data. As discussed above, the first actual optical data may include a total luminance value of the first area, a luminance value X of all red sub-pixels in the first area, a luminance value Y of all green sub-pixels in the first area, and a luminance value Z of all blue sub-pixels in the first area. Here, the term “luminance value” indicates an actual luminance value of the object given the standard picture(s).

Subsequent to step S, as shown in, the method further includes step S.

At step S, corresponding first compensation data is generated according to a first compensation rule, the standard optical data, and the first actual optical data.

As can be seen from the above discussion, the standard optical data may include luminance values of sub-pixels of each color in each of the divided areas in the display area. For example, the first areamay be any one or more of the nine areas in, that is, the standard optical data of the first area(referred to as the first standard optical data) may be determined from the standard optical data. Further, based on the theoretical optical data (i.e., the first standard optical data) and the actual optical data (i.e., the first actual optical data) of the first area, the first compensation data corresponding to the first areamay be generated.

Specifically, as shown in, the number of the standard pictures is greater than one, and the step Smay include, but is not limited to, the following step S.

At step S, a plurality of compensation coordinates corresponding to a plurality of the standard pictures is generated according to the first compensation rule, a plurality of the standard optical data of the display panel corresponding to the plurality of the standard pictures, and a plurality of the first actual optical data of the first area corresponding to the plurality of the standard pictures. Each of the compensation coordinates includes a plurality of first compensation elements, and the plurality of compensation coordinates constitute the first compensation data.

As can be seen from the above discussion, given each standard picture, the first areahas theoretical optical data (i.e., the first standard optical data) and actual optical data (i.e., the first actual optical data), so that a plurality of first compensation data of the first areacorresponding to a plurality of the standard pictures may be generated.

Based on the fact that each pixel cell includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, the number of the first compensation elements in the compensation coordinate may also be three. That is, the number of the first compensation elements in the compensation coordinate is equal to the number of sub-pixels in the pixel cell. Each of the first compensation elements may represent the degree of compensation for the sub-pixel of the corresponding color in the first area. Further, the plurality of compensation coordinates which corresponds to the plurality of standard pictures constitute the first compensation data.

Further, as shown in, the step Smay include, but is not limited to, the following steps Sto Sand combinations of the following steps Sto S.

At step S, first standard optical data corresponding to the first area is determined according to the standard optical data and positional data of the first area in the display area.

The standard optical data may include positional data of each of a plurality of areas (for example, the nine areas in, in which the first areamay be at least one area of the nine areas) and a theoretical luminance value of the area given a standard picture, so that the corresponding first standard optical data of the first areamay be determined from the standard optical data according to the positional data of the first areain the display area.

At step S, a transition compensation coordinate is generated according to the first compensation rule, the first standard optical data corresponding to each of the standard pictures, and the first actual optical data corresponding to the standard picture.

As discussed above, each standard picture has a set of corresponding R, G, and B, and a current transition compensation coordinate may be generated based on current first actual optical data and the fixed first standard optical data corresponding to the first area. Similarly, the transition compensation coordinate (ΔR, ΔG, ΔB) may also include three first transition compensation elements ΔR, ΔG, ΔB respectively corresponding to sub-pixels of three colors. Herein, the first compensation rule may depend on, but are not limited to, 3D Look-Up Table (3D LUT), and the above process of generating the transition compensation coordinate may be understood as follows.

Taking pre-acquired first standard optical data as a target, and starting from the first actual optical data presented by controlling the display area to emit light in accordance with initial display data (which is used for determining the set of corresponding R, G, and B), by observing the difference between the real-time color(s) of the first areaand the color(s) of the first areain the standard picture with the human eye(s), and/or measuring the difference between the real-time color(s) of the first area(i.e. the real-time luminance values of sub-pixels of three colors, which are included in the third actual optical data described below) and the theoretical color(s) of the first areain the standard picture (i.e. the theoretical luminance values of sub-pixels of three colors, which are included in the first standard optical data described above) with optical instrument(s), the initial display data (the initial display data after each round of adjustment may correspond to the current three first transition compensation elements) is continuously adjusted until the two color(s) mentioned above are consistent, and the current transition compensation coordinate is recorded.

Similarly, each standard picture may be subjected to the above process so as to acquire the corresponding at least one transition compensation coordinate.

At step S, the first area is compensated according to the transition compensation coordinate, and third actual optical data of the compensated first area corresponding to the standard picture is acquired.

At step S, a first difference between the third actual optical data and the first standard optical data is calculated and the transition compensation coordinate is determined as the compensation coordinate of the first area when an absolute value of the first difference is less than a first error threshold.

Further, for the determination of the compensation coordinates, there may two understandings as follows.

(1) If the difference between the real-time color(s) (which corresponds to the third actual optical data) of the first areacorresponding to any of the standard pictures and the theoretical color(s) (which corresponds to the first actual optical data) of the first areacorresponding to the standard picture is large, that is, the transition compensation coordinate given the standard picture is considered to be not satisfactory in this case, then at this point it is necessary to continue to adjust the current transition compensation coordinate given the standard picture so as to acquire a next transition compensation coordinate, and so on so forth, until the difference between current third actual optical data and the first standard optical data of the first areais small, that is, the absolute value of the difference between the two (i.e., a first difference) is smaller than the first error threshold. In terms of color difference, it can be understood that in the case that the color difference between a picture of the first areacorresponding to the first standard optical data and a picture of the first areacorresponding to the third actual optical data is smaller than the first error threshold (which may be equal to 2), the current transition compensation coordinate may be set as the compensation coordinate corresponding to the standard picture.

(2) If the difference between the average value of the real-time colors (which corresponds to the third actual optical data) of the first areacorresponding to all the standard pictures and the theoretical color (which corresponds to the first actual optical data) is large, that is, a current 3D LUT composed of a plurality of transition compensation coordinates generated on the basis of all the standard pictures is considered to be not satisfactory in this case, then at this point it is necessary to continue to adjust the transition compensation coordinate given each standard picture so as to acquire a next transition compensation coordinate, and so on so forth, until the difference (i.e., a first difference) between the current third actual optical data and the first standard optical data of the first areais small, that is, the absolute value of the difference between the two is smaller than the first error threshold. In terms of color difference, it can be understood that given each standard picture, there is/are corresponding color difference(s) between a picture corresponding to the first standard optical data and a picture corresponding to the third actual optical data, and if the average value of a plurality of color differences corresponding to a plurality of standard pictures is smaller than the first error threshold (which may be equal to 2), then a plurality of current transition compensation coordinates may be set as the compensation coordinates corresponding to the plurality of standard pictures, respectively.

Herein, the color difference may be calculated with reference to the CIEDE2000 color difference formula where L (the total luminance value of a picture, L=0 denotes black, L=100 denotes white), a (the position of a picture between red and green, a<0 denotes bias toward green, a>0 denotes bias toward red), and b (the position of a picture between yellow and blue, b<0 denotes bias toward blue, b>0 denotes bias toward yellow) with respect to two pictures are involved. L, a, and b may be measured directly via an optical instrument. Alternatively, respective L, a, and b may be calculated from X, Y, Z of a respective picture measured by the optical instrument.

Combining the previous discussion on “a set of corresponding R, G, and B may be determined from the initial display data corresponding to each of the standard pictures” and “the transition compensation coordinate (ΔR, ΔG, ΔB) may also include three first transition compensation elements ΔR, ΔG, ΔB respectively corresponding to sub-pixels of three colors”, it can be understood that if the difference between the real-time color(s) and the theoretical color(s) of the first areacorresponding to one of the standard pictures is small, that is, the transition compensation coordinate given the standard picture are considered to be satisfactory in this case, then the transition compensation coordinate at this point may be used as the compensation coordinate corresponding to the standard picture. That is, the three first compensation elements in the compensation coordinate (ΔR, ΔG, ΔB) are the current three first transition compensation elements ΔR, ΔG, ΔB, respectively.

Subsequent to Step S, as shown in, the method further includes step S.

At step S, the display panel is compensated according to the first compensation data, and second actual optical data of the second area in the compensated display panel corresponding to the one or more standard pictures is acquired.